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Nitrous oxide gas removal by using compost-based biofilter medium

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安全与环境学报 2010年第5期10卷 61-64页

作者： Tania Surya UTAMI Heri HERMANSYAH Josia SIMANJUNTAK M.nasikin Chemical Engineering Department Faculty of EngineeringUniversity of Indonesia Campus UI Depok

This paper is aimed at introducing our research result in the efficiencyin removing nitrous oxide gas (N_2O) by using compost as a medium filter,which is actually a kind of manure derived from cow faeces at KukusanKelurahan farm conlaing wood chips and some other microorganisms. Practicallyspeaking, N_2O is a major greenhouse gas, whose continuous presence in theatmosphere is expected to last over a 100 years and produce its radiative warmingeffect just next to CO_2. In spite of its rather small concentration in the atmosphere,it is the Number Four largest greenhouse gas contributor to the overallglobal warming, behind carbon dioxide, methane and water vapour. Thebiofiltration experiments we have conducted to explore its removing rate of N_2Ofrom flue gas help us to find various operating factors in the biofilter system. Sofar as we know, N_2O gas has been fed from the top of the column. It was flowingthrough the column when it is made to get circulated with a peristaltic pumpfor 6 hours. The data obtained in our paper prove to be in conformity with theLangmuir adsorption model. The highest N_2O gas removing efficiency can bemade to be as high as 70.22% at the highest biofilter length of 50 cm with thegas flowing rate of 200 mL/min. The results of this research have finally beenmodeled by the Langmuir adsorption isotherm formula with its K value obtainedbeing 16.949 L/mol.

关键词：摘要编辑部编辑工作读者

The Effects of Cells Density Arrangement in Chlorella vulgaris Culture to C02 Fixation and Essential Substances Production

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Journal of Chemistry and Chemical Engineering 2012年第2期6卷 153-157页

作者： Dlanursanti Anondho Wijanarko Muhammad nasikin Department of Chemical Engineering Faculty of Engineering University of lndonesia Depok 16424 Indonesia

Structure, Energy Band Gap and Electrical Conductivity of Tapioca/Metal Oxide Composite

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Journal of Chemistry and Chemical Engineering 2012年第10期6卷 911-919页

作者： Nuryetti Heri Hermansyah Mohammad nasikin Department of Chemical Engineering Universitas Indonesia Depok 16424 Indonesia

A natural polymer composite is the main choice to replace composites from petroleum derivatives. A composite is formed in two or more phases (i. e., organic and inorganic phases). A composite that has specified energy band gap, electrical conductivity, and tensile strength can be used as semiconductor material. The objective of this research was to study the effect of production methods, concentration and type of metal oxide filler (TiO2, Al2O3, Fe2O3, and ZnO) on structure, energy band gap, and electrical conductivity of composites. Composites were prepared using a melt intercalation process with tapioca as a matrix and addition of 1%, 3%, 5% and 7% filler concentrations, and sonication processing time in interval of 40, 50, and 60 min. Structure and morphology of the composite were analyzed using FT-IR, XRD, SEM, and TEM. UV-vis was used to measure the energy band gap while electrical conductivity was measured using a potentiostat through determination of resistivity. In addition, tensile strength and elongation were measured by ASTM 822-02. The energy band gap of the tapioca/metal oxide composite was between 4.9-1.62 eV. Electrical conductivity showed a percolation thresholds for concentrations of 3%-5% TiO2, Al2O3, and Fe2O3 and 7% ZnO. The tapioca/ZnO composite with 5% ZnO and 50 min of processing time showed a maximum tensile strength of 74.84 kgf/cm2, 6% elongation, 1.27 × 10-7 ohm-1·cm-1 electrical conductivity and energy band gap of 3.27 eV. The characteristics described show that the tapioca/metal oxide composite can be used as a semiconductor material.

关键词：高分子复合材料金属氧化物木薯淀粉电导率结构带间隙半导体材料拉伸强度

Utilization of Sweet Potato Starch for Producing Biocomposite Semiconductor Materials

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Journal of Chemistry and Chemical Engineering 2013年第1期7卷 26-33页

作者： Hen Hermansyah Zayyanatun Zulfa Slamet Nuryeti M. nasikin Department of Chemical Engineering Faculty of Engineering University of Indonesia Depok 16424 Indonesia

Starch is one of the most promising natural polymers source because it is an adsorbent, universally available and low cost. However, the properties of starch-based materials are not satisfactory. This weakness can be overcome by adding other materials to form biocomposite. Biocomposite is a composite material of a natural polymer (organic phase) and reinforcement/filler (inorganic phase). The use of filler material that has the properties of semiconductor will produce composite that have semiconducting properties as well. In this research, biocomposite was cast using ZnO as filler in the matrix of sweet potato starch plasticised by glycerol. From the results of XRD (X-ray diffraction) and SEM (scanning electron microscope) analysis showed that ZnO has been dispersed in the matrix and the results of FT-IR was found that sweet potato starch, glycerol, and ZnO are united to form biocomposite. From the test results of mechanical, physical and electrical properties were found that the addition of ZnO concentration of 1%, 3% and 6% lead to improvement of tensile strength from 24.68 kgf/cm2 to 34.43 kgf/cm2, decrease in elongation from 26.96% to 8.5%, decrease in water vapour transmission rate from 8.6270 gr·m-2·h-1 to 4.581 gr·m-2·h-1, increase in UV absorbance, and conductivity of 5.864 × 10-7 S/cm. Addition of glycerol concentration of 15%, 25% and 35% wt causes an increase in elongation from 8.75% to 33.04%, and decrease in tensile strength from 54.57% to 14.64%.

关键词：生物复合材料半导体材料红薯淀粉淀粉生产扫描电子显微镜半导体性能甘油浓度 X-射线衍射